launchEditor.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
'use strict';

const fs = require('fs');
const path = require('path');
const child_process = require('child_process');
const os = require('os');
const chalk = require('chalk');
const shellQuote = require('shell-quote');

function isTerminalEditor(editor) {
  switch (editor) {
    case 'vim':
    case 'emacs':
    case 'nano':
      return true;
  }
  return false;
}

// Map from full process name to binary that starts the process
// We can't just re-use full process name, because it will spawn a new instance
// of the app every time
const COMMON_EDITORS_OSX = {
  '/Applications/Atom.app/Contents/MacOS/Atom': 'atom',
  '/Applications/Atom Beta.app/Contents/MacOS/Atom Beta':
    '/Applications/Atom Beta.app/Contents/MacOS/Atom Beta',
  '/Applications/Brackets.app/Contents/MacOS/Brackets': 'brackets',
  '/Applications/Sublime Text.app/Contents/MacOS/Sublime Text':
    '/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl',
  '/Applications/Sublime Text Dev.app/Contents/MacOS/Sublime Text':
    '/Applications/Sublime Text Dev.app/Contents/SharedSupport/bin/subl',
  '/Applications/Sublime Text 2.app/Contents/MacOS/Sublime Text 2':
    '/Applications/Sublime Text 2.app/Contents/SharedSupport/bin/subl',
  '/Applications/Visual Studio Code.app/Contents/MacOS/Electron': 'code',
  '/Applications/Visual Studio Code - Insiders.app/Contents/MacOS/Electron':
    'code-insiders',
  '/Applications/AppCode.app/Contents/MacOS/appcode':
    '/Applications/AppCode.app/Contents/MacOS/appcode',
  '/Applications/CLion.app/Contents/MacOS/clion':
    '/Applications/CLion.app/Contents/MacOS/clion',
  '/Applications/IntelliJ IDEA.app/Contents/MacOS/idea':
    '/Applications/IntelliJ IDEA.app/Contents/MacOS/idea',
  '/Applications/PhpStorm.app/Contents/MacOS/phpstorm':
    '/Applications/PhpStorm.app/Contents/MacOS/phpstorm',
  '/Applications/PyCharm.app/Contents/MacOS/pycharm':
    '/Applications/PyCharm.app/Contents/MacOS/pycharm',
  '/Applications/PyCharm CE.app/Contents/MacOS/pycharm':
    '/Applications/PyCharm CE.app/Contents/MacOS/pycharm',
  '/Applications/RubyMine.app/Contents/MacOS/rubymine':
    '/Applications/RubyMine.app/Contents/MacOS/rubymine',
  '/Applications/WebStorm.app/Contents/MacOS/webstorm':
    '/Applications/WebStorm.app/Contents/MacOS/webstorm',
  '/Applications/MacVim.app/Contents/MacOS/MacVim':
    'mvim',
};

const COMMON_EDITORS_LINUX = {
  atom: 'atom',
  Brackets: 'brackets',
  code: 'code',
  'code-insiders': 'code-insiders',
  emacs: 'emacs',
  'idea.sh': 'idea',
  'phpstorm.sh': 'phpstorm',
  'pycharm.sh': 'pycharm',
  'rubymine.sh': 'rubymine',
  sublime_text: 'sublime_text',
  vim: 'vim',
  'webstorm.sh': 'webstorm',
};

const COMMON_EDITORS_WIN = [
  'Brackets.exe',
  'Code.exe',
  'Code - Insiders.exe',
  'atom.exe',
  'sublime_text.exe',
  'notepad++.exe',
  'clion.exe',
  'clion64.exe',
  'idea.exe',
  'idea64.exe',
  'phpstorm.exe',
  'phpstorm64.exe',
  'pycharm.exe',
  'pycharm64.exe',
  'rubymine.exe',
  'rubymine64.exe',
  'webstorm.exe',
  'webstorm64.exe',
];

// Transpiled version of: /^[\p{L}0-9/.\-_\\]+$/u
// Non-transpiled version requires support for Unicode property regex. Allows
// alphanumeric characters, periods, dashes, slashes, and underscores.
const WINDOWS_FILE_NAME_WHITELIST = /^(?:[\x2D-9A-Z\\_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0560-\u0588\u05D0-\u05EA\u05EF-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u0860-\u086A\u08A0-\u08B4\u08B6-\u08BD\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u09FC\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16F1-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1878\u1880-\u1884\u1887-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1C80-\u1C88\u1C90-\u1CBA\u1CBD-\u1CBF\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312F\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FEF\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B-\uA7B9\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA8FE\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDE80-\uDE9C\uDEA0-\uDED0\uDF00-\uDF1F\uDF2D-\uDF40\uDF42-\uDF49\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF]|\uD801[\uDC00-\uDC9D\uDCB0-\uDCD3\uDCD8-\uDCFB\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDCE0-\uDCF2\uDCF4\uDCF5\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE35\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE4\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2\uDD00-\uDD23\uDF00-\uDF1C\uDF27\uDF30-\uDF45]|\uD804[\uDC03-\uDC37\uDC83-\uDCAF\uDCD0-\uDCE8\uDD03-\uDD26\uDD44\uDD50-\uDD72\uDD76\uDD83-\uDDB2\uDDC1-\uDDC4\uDDDA\uDDDC\uDE00-\uDE11\uDE13-\uDE2B\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEDE\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3D\uDF50\uDF5D-\uDF61]|\uD805[\uDC00-\uDC34\uDC47-\uDC4A\uDC80-\uDCAF\uDCC4\uDCC5\uDCC7\uDD80-\uDDAE\uDDD8-\uDDDB\uDE00-\uDE2F\uDE44\uDE80-\uDEAA\uDF00-\uDF1A]|\uD806[\uDC00-\uDC2B\uDCA0-\uDCDF\uDCFF\uDE00\uDE0B-\uDE32\uDE3A\uDE50\uDE5C-\uDE83\uDE86-\uDE89\uDE9D\uDEC0-\uDEF8]|\uD807[\uDC00-\uDC08\uDC0A-\uDC2E\uDC40\uDC72-\uDC8F\uDD00-\uDD06\uDD08\uDD09\uDD0B-\uDD30\uDD46\uDD60-\uDD65\uDD67\uDD68\uDD6A-\uDD89\uDD98\uDEE0-\uDEF2]|\uD808[\uDC00-\uDF99]|\uD809[\uDC80-\uDD43]|[\uD80C\uD81C-\uD820\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDED0-\uDEED\uDF00-\uDF2F\uDF40-\uDF43\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDE40-\uDE7F\uDF00-\uDF44\uDF50\uDF93-\uDF9F\uDFE0\uDFE1]|\uD821[\uDC00-\uDFF1]|\uD822[\uDC00-\uDEF2]|\uD82C[\uDC00-\uDD1E\uDD70-\uDEFB]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB]|\uD83A[\uDC00-\uDCC4\uDD00-\uDD43]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0]|\uD87E[\uDC00-\uDE1D])+$/

function addWorkspaceToArgumentsIfExists(args, workspace) {
  if (workspace) {
    args.unshift(workspace);
  }
  return args;
}

function getArgumentsForLineNumber(
  editor,
  fileName,
  lineNumber,
  colNumber,
  workspace
) {
  const editorBasename = path.basename(editor).replace(/\.(exe|cmd|bat)$/i, '');
  switch (editorBasename) {
    case 'atom':
    case 'Atom':
    case 'Atom Beta':
    case 'subl':
    case 'sublime':
    case 'sublime_text':
      return [fileName + ':' + lineNumber + ':' + colNumber];
    case 'wstorm':
    case 'charm':
      return [fileName + ':' + lineNumber];
    case 'notepad++':
      return ['-n' + lineNumber, '-c' + colNumber, fileName];
    case 'vim':
    case 'mvim':
    case 'joe':
      return ['+' + lineNumber, fileName];
    case 'emacs':
    case 'emacsclient':
      return ['+' + lineNumber + ':' + colNumber, fileName];
    case 'rmate':
    case 'mate':
    case 'mine':
      return ['--line', lineNumber, fileName];
    case 'code':
    case 'Code':
    case 'code-insiders':
    case 'Code - Insiders':
      return addWorkspaceToArgumentsIfExists(
        ['-g', fileName + ':' + lineNumber + ':' + colNumber],
        workspace
      );
    case 'appcode':
    case 'clion':
    case 'clion64':
    case 'idea':
    case 'idea64':
    case 'phpstorm':
    case 'phpstorm64':
    case 'pycharm':
    case 'pycharm64':
    case 'rubymine':
    case 'rubymine64':
    case 'webstorm':
    case 'webstorm64':
      return addWorkspaceToArgumentsIfExists(
        ['--line', lineNumber, fileName],
        workspace
      );
  }

  // For all others, drop the lineNumber until we have
  // a mapping above, since providing the lineNumber incorrectly
  // can result in errors or confusing behavior.
  return [fileName];
}

function guessEditor() {
  // Explicit config always wins
  if (process.env.REACT_EDITOR) {
    return shellQuote.parse(process.env.REACT_EDITOR);
  }

  // We can find out which editor is currently running by:
  // `ps x` on macOS and Linux
  // `Get-Process` on Windows
  try {
    if (process.platform === 'darwin') {
      const output = child_process.execSync('ps x').toString();
      const processNames = Object.keys(COMMON_EDITORS_OSX);
      for (let i = 0; i < processNames.length; i++) {
        const processName = processNames[i];
        if (output.indexOf(processName) !== -1) {
          return [COMMON_EDITORS_OSX[processName]];
        }
      }
    } else if (process.platform === 'win32') {
      const output = child_process
        .execSync('powershell -Command "Get-Process | Select-Object Path"', {
          stdio: ['pipe', 'pipe', 'ignore'],
        })
        .toString();
      const runningProcesses = output.split('\r\n');
      for (let i = 0; i < runningProcesses.length; i++) {
        // `Get-Process` sometimes returns empty lines
        if (!runningProcesses[i]) {
          continue;
        }

        const fullProcessPath = runningProcesses[i].trim();
        const shortProcessName = path.basename(fullProcessPath);

        if (COMMON_EDITORS_WIN.indexOf(shortProcessName) !== -1) {
          return [fullProcessPath];
        }
      }
    } else if (process.platform === 'linux') {
      // --no-heading No header line
      // x List all processes owned by you
      // -o comm Need only names column
      const output = child_process
        .execSync('ps x --no-heading -o comm --sort=comm')
        .toString();
      const processNames = Object.keys(COMMON_EDITORS_LINUX);
      for (let i = 0; i < processNames.length; i++) {
        const processName = processNames[i];
        if (output.indexOf(processName) !== -1) {
          return [COMMON_EDITORS_LINUX[processName]];
        }
      }
    }
  } catch (error) {
    // Ignore...
  }

  // Last resort, use old skool env vars
  if (process.env.VISUAL) {
    return [process.env.VISUAL];
  } else if (process.env.EDITOR) {
    return [process.env.EDITOR];
  }

  return [null];
}

function printInstructions(fileName, errorMessage) {
  console.log();
  console.log(
    chalk.red('Could not open ' + path.basename(fileName) + ' in the editor.')
  );
  if (errorMessage) {
    if (errorMessage[errorMessage.length - 1] !== '.') {
      errorMessage += '.';
    }
    console.log(
      chalk.red('The editor process exited with an error: ' + errorMessage)
    );
  }
  console.log();
  console.log(
    'To set up the editor integration, add something like ' +
      chalk.cyan('REACT_EDITOR=atom') +
      ' to the ' +
      chalk.green('.env.local') +
      ' file in your project folder ' +
      'and restart the development server. Learn more: ' +
      chalk.green('https://goo.gl/MMTaZt')
  );
  console.log();
}

let _childProcess = null;
function launchEditor(fileName, lineNumber, colNumber) {
  if (!fs.existsSync(fileName)) {
    return;
  }

  // Sanitize lineNumber to prevent malicious use on win32
  // via: https://github.com/nodejs/node/blob/c3bb4b1aa5e907d489619fb43d233c3336bfc03d/lib/child_process.js#L333
  // and it should be a positive integer
  if (!(Number.isInteger(lineNumber) && lineNumber > 0)) {
    return;
  }

  // colNumber is optional, but should be a positive integer too
  // default is 1
  if (!(Number.isInteger(colNumber) && colNumber > 0)) {
    colNumber = 1;
  }

  let [editor, ...args] = guessEditor();

  if (!editor) {
    printInstructions(fileName, null);
    return;
  }

  if (editor.toLowerCase() === 'none') {
    return;
  }

  if (
    process.platform === 'linux' &&
    fileName.startsWith('/mnt/') &&
    /Microsoft/i.test(os.release())
  ) {
    // Assume WSL / "Bash on Ubuntu on Windows" is being used, and
    // that the file exists on the Windows file system.
    // `os.release()` is "4.4.0-43-Microsoft" in the current release
    // build of WSL, see: https://github.com/Microsoft/BashOnWindows/issues/423#issuecomment-221627364
    // When a Windows editor is specified, interop functionality can
    // handle the path translation, but only if a relative path is used.
    fileName = path.relative('', fileName);
  }

  // cmd.exe on Windows is vulnerable to RCE attacks given a file name of the
  // form "C:\Users\myusername\Downloads\& curl 172.21.93.52". Use a whitelist
  // to validate user-provided file names. This doesn't cover the entire range
  // of valid file names but should cover almost all of them in practice.
  if (
    process.platform === 'win32' &&
    !WINDOWS_FILE_NAME_WHITELIST.test(fileName.trim())
  ) {
    console.log();
    console.log(
      chalk.red('Could not open ' + path.basename(fileName) + ' in the editor.')
    );
    console.log();
    console.log(
      'When running on Windows, file names are checked against a whitelist ' +
        'to protect against remote code execution attacks. File names may ' +
        'consist only of alphanumeric characters (all languages), periods, ' +
        'dashes, slashes, and underscores.'
    );
    console.log();
    return;
  }

  let workspace = null;
  if (lineNumber) {
    args = args.concat(
      getArgumentsForLineNumber(
        editor,
        fileName,
        lineNumber,
        colNumber,
        workspace
      )
    );
  } else {
    args.push(fileName);
  }

  if (_childProcess && isTerminalEditor(editor)) {
    // There's an existing editor process already and it's attached
    // to the terminal, so go kill it. Otherwise two separate editor
    // instances attach to the stdin/stdout which gets confusing.
    _childProcess.kill('SIGKILL');
  }

  if (process.platform === 'win32') {
    // On Windows, launch the editor in a shell because spawn can only
    // launch .exe files.
    _childProcess = child_process.spawn(
      'cmd.exe',
      ['/C', editor].concat(args),
      { stdio: 'inherit' }
    );
  } else {
    _childProcess = child_process.spawn(editor, args, { stdio: 'inherit' });
  }
  _childProcess.on('exit', function(errorCode) {
    _childProcess = null;

    if (errorCode) {
      printInstructions(fileName, '(code ' + errorCode + ')');
    }
  });

  _childProcess.on('error', function(error) {
    printInstructions(fileName, error.message);
  });
}

module.exports = launchEditor;